Airspeed

I'm using an I2C replicator to fit on Pixhawk. Here + GPS + Compass is connected to the I2C coupler, the I2C runs smoothly, and it works separately. I2C does not work when the airspeed is connected. The I2C is running when the airspeed is only connected alone. My plane SKY V8 is a VTOL with a fixed wing.What is the source of the above-mentioned problem? How can I solve this problem?